Sound box



F. CHENEY.

SOUND BOX.

APPLICATION FILED APR.3(1, 191.7.

Patentd May 30, 1922.

FOREST CHENEY, OF (IHICAGO, ILLINOIS, ASSIGNOR TO CHENEY TALKING MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SOUND BOX.

, nausea.

To all whom it may concern:

Be it known that I, FQREST CHENEY, a citizen of the United States," and resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in a Sound Box, of which the following is a specification. 4 My invention relates to sound reproducing machines and particularly to a novel sound box for use in connection therewith.

It is desirable to maintain a balance of tone power between the higher and lower tone registers of a musical composition when it is being reproduced from a record.

One of the principal objects of the present invention is to so design the reproducing diaphragm with relation to the adjacent chamber that the reproduced low tones are full and resonant and the high tones clear and brilliant. The desired result is secured by forming a cavity of increasing depth from the center to the periphery of the dia phragrn, the cavity .being defined by a wall of the sound boxat one side and the diaphragm at the other side. Preferably the desired'result is secured by concaving the diaphragm and convexing the wall, although a similar result might be secured by so shaping one only of the parts' I will not attempt herein to scientifically explain the reason for the increased efiiciency of tone production, except to point out that the lower tones, which are formed bv the slower vibrations, and which are niore fully developed on the outer or larger radius of the diaphragm, are enabled to set up similar vibrations within a larger body of air. The shorter vibrations, which occur nearer the center of the diaphragm, should set up similar vibrations in a smaller body of air.

, waves are thus developed in separate air and deflected toward from the sound box.

A further object is to' provide on the opposed faces of the sound box wall and the diaphragm. a plurality of sound reflectors in the form of rings or ribs having an in clined approach thereto on one side. The other side being more abrupt the, sound chambers of larger and smaller dimensions the center er eutlet Specification of Letters Iatent.

Application filed April 30, 1917. Serial No. 165,401.

Patented 3t A further object is the provision of means for mounting the needle arm on the sound box whereby there shall be no metallic contact except at the fulcrum points. At these points the fulcrum pins are fitted within suitable apertures in such manner that all wear is taken up automatically and the possibility of chatter arising from looseness and metallic contacts is avoided.

A still further object is-to'provide a load- 'ing chute by means of which the removable needles may be. accurately placed in the needle holder from the rear end thereof.

The invention will be more readily understood by reference to the accompanying drawings in which, v Fig. 1 is a front view of a sound box constructed in accordance with my invention; Fig. 2 is an enlarged sectional view through such a sound box;

Fig. is a fragmentary transverse vertical view on the line of Fig. 2, the loadin chute being, omitted; 4

ig. 4 is a bottom plan view,and, Fig. 5 is a hor zontal sectional view showing a slightly modifiedform. of diaphragm.

In the drawings the sound box is shown as provided with a cylindrical sleeve 10, and the casing 11. Marginal flange 12, provides means for the attachment of the ornamental cover plate 13. The plate serves also the purpose of retaining the non-metallic-rings 1415 in position, between which rings the diaphragm 16 is confined. It will be noted that the space defined by the wall 17 oi the sound box and the inner surface 18 of the.

diaphragm is of increasingly greater depth from the center to the periphery thereof. As heretofore stated, this serves a usefulpurposein the reproduction of the different the advantage of developing the sound wavesof-the higher and lower registers in larger and smaller .air'chambers and do fleeting-them outwardly, or in other words, toward the opening 21 in the sound. box.

The needle arm 22 is secured to the center of the diaphragm andon its lower end is fitted to the needle holder 23. The needle arm is secured in position by means of two screws 2 1-, which. engage the sound hox'with.

their threaded portions, and at their outer ends engage rubber bushings 25 seated in openings in the lateral extensions 26 of the needle arm. The bushings, are provided with an intermediate peripheral flange 27, which bears at one side against the part 25 and at the other; side against a flat U-shaped spring 28. spring" lies beneath the head of the screw. The fulcrums for the needle arm comp'rise the pointed pins 30 seated in suitable open-- ings in the sound box, the which engage with the apertures 31 within the portion 26 of the needle mm. It will be noted that the only metallic connection between the needle arm and the. sound heir is where the pointed" pins 30 on age with the apertures. In view of the 'resi iency ireparted by the rubber bushings the needle arm is held firmly in position and the possibility of chattering, due to wear, is avoided.

The needle holder 23 is provided with the usual clamping screw. 32, the opening 33 for the needle being continuous from end to and of the holder. Rigidly secured to the cover plate i3 is the loading chute or guide 34, the lower end of which terminates a short distance above the open upper end ofthe needle holder. When it is desired to re place a needle'the clamping screw is released, allowing the used needle to drop out, where upon a new needle is placed in the breeclv loading device whereby it is dropped to the proper position and may be clamped in the usual manner.

in the construction of Fig". 5 the sound reflecting surfaces are omitted. However, the diaphragm 35 and the wall 36 are so shaped as to define space of gradually increasing depth toward the periphery or the diaphragm. Otherwise the construction is the same as that heretofore described.

It will be noted that the diaphragm and the opposed wall, ofjthc sound box are each convex with relation to a plane perpendicw lar to the outlet from the box and which plane intersects the space between the walland diaphragm. There is thus formed a space which -concavo-conyex. Preferably, also. the surfaces of the diaphragm and wall are provided with the opposed concentric ribs, the inner angzlc of inclination of which is more abruy t than the outer angle.

l (.4 will be understood, of course, that Wl11li.-

certain advantages accrue to the use of the deflecting ribs in association with a such as described, yet either of the featuccs may, be used separately to advantage.

The other terminal 29 of the pointed ends of I to engage at point in its jacent we'll, the 1 air chambers between said diaphragm one wall and to dclleetsound waves toward the 'outlet from the... hex, sues Lei-wee It will be noted also that the fulcrum bearing between the needle arm and the casing is in such form that a circular line contact is secured. employment of a conical head pin which engages with the material surrounding parallel sided aperture.

1 claim: A

l. A. sound hex, comprising in combination, a diaphragm and an opposed wall, said diaphragm and wall being convex with rel-.1- tion to a plane which is perpendicular to the outlet from the box and which intersects the space between the wall and diaphragm,

suhstantially as described.

A. sound box, having a wall adjacent the diaphragm provided with a plurality of concentric ribs, the inner angle of inclinaon of which is abrupt whereby sound waves are deflected toward the outlet from the box, suostantially as described.

in a sound box, the combination of a concentrically ribbed diaphragm and a similarly ribbed adjacent wall, the ribs being so shaped as to deflect sound waves toward the This results from the outlet from the box, substantially as described. i

In sound box, the combination of a diaphragm, and an opposed wall, said wall and diaphragm defining a space, and concentric sound deflecting rihe on said dia phragm and said wall so shaped as to defleet sound we s toward outlet from the hex, suhstant: 5. in soc. b n combination, a needle arm, a holding coil V cion between the arm and the box includir contact with one ea iulcruzn having line fin sound needle arm havii qhlcruni r said fulcrum incluoo1. a conical oe nuiterial surrounding ailorients circular line contact 'ZijliO tially as described.

T4". a sound hon, the combination of needle arm. havine' fulcrum bearing on said box, holding connection, said connec tion including; a screw rigidly enga one member and resiliently so: cell from the other member thron hashing, and hetwcen the head euhstantially as dc spring means internosed the screw and bush scribed.

8. in a sound 3*" ribbed diaphragm a oa..u1ila i being so. shape her series oi graduated concentric prov ide it I, do

I no

fixing a series of cribed.

10. In sound box, the combination of needle arm aced from and having a 11;- srum bearing an said sound 1102;, holdizig' connection, saifl (ronneceiun including &- SCZEW rigidly engaging the box and resihentliy spaced from the arm thmugh a rubbar bush air chamber of pmgres lvely increasing depth, substantially as de-.

111g Carried in the la'cteer, and spring; means interposed betwe an the screw and bushing and spaced mi-rm the, arm by the bushing.

Eignsd atflhicago, Hiinois, *ahis 16th day of April, A. D, 5.917.,

FOREST CHEW? Y 

